The angular magnification of a telescope is 300 What should be the diameter of the objective, if our eyes at the eye ring, are just able to collect all the light refracted from the objective. Take diameter of pupil of eye = 3mm .
Angular magnification of telescope if focal length of objective and eye lenses are 10 cm and 10 mm respectively and tube length is 11cm:
At what magnification T of a telescope with a diameter of the objective D = 6.0 cm is the illuminance of the image of an object on the retina not less than without the telescope ? The pupil diameter is assumed do be equal to d_(0) = 3.0 mm . The losses of light in the telescope are negligible.
A Keplerian telescope with magnification T = 15 was submerged into water which filled up the inside of the telescope. To make the system work as a telescope again within the former dimensions, the objective was replaced. What has the magnification of the telescope become equal to ? the refractive index of the glass of which the ocular is made is equal to n = 1.50 .
(i) A giant refracting telescope at an observatory has an objective lens of focal length 15 m . If an eyepiece of focal length 1.0 cm is used, what is angular magnification of the telescope ? (ii) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens ? the diameter of the moon is 3.48xx10^(6)m , and the radius of lunar orbit is 3.8xx10^(8) m .
A gaint refrecting telescope at an observatory has an objective lens of focal length 15 m . If an eye piece lens of focal length 1 cm is used, find the angular magnification of the telescope. If this telescope is used to view the moon, what is the diameter of image of moon formed by objective lens ? The diameter of the moon is 3.42 xx 10^6 m and radius of lunar orbit is 3.8 xx 10^8 m .
